Core barrel



March 3, 1936. L. A. LARSON ET AL CORE BARREL Filed Feb. 18, 1935 2 Sheets-Sheet 1 'IlII myt-#7035; [tw/.s l. Lnsom B mvr/Ian 8044..

/ TT RA' X- March 3, 1936. A. LARSON -:r AL

CORE BARREL F-ied Feb. 18, 1935 2 Sheets-Sheet 2 IV [tw/s Musa/ sou.

In mun /ITTOR/VEX.

Pateited Mar. I 3, 1936 UNITED sm s PATEN TiOEFlCE z,o3z,423

CORE mann. Lewls A. Larson andArthr sou, Compton, cam.

' Application February' s, 1935, Serial No. "1,023

17 Clams.

barre] of the character stated, in which the circuiating mud is prevented from Contacting and 10 washing the core after ,the core has entered the barrel.

Another object is to provide a core barrel of the character stated, in which the fluid in the upper part of the core chainber is released in a j novei and efiective manner.

Stili another object is/to provide a novei means of releasably ngaging the core retaining tubes and reieasing the tubes one at a time so that they may move upwardly as the core fills the 20 same. i

n Still another object is to provide a novei means of suspending the core retaining chamber and the telescoping core tubes so that the. chamher and the tubes can remain stationary while the .25 outer barrel and the corebit rotates and moves into the ormation.

Other objects, advantages and features of invention may appear from 'the accompanying drawings, the s'ubjoined detaiied description, and 30 the appended ciaims. a

Figura 1 g is a fragmentary ion'gitudinal sectionai view of the upper portion oi' the core barrel. Figura 2 is a fragmentary longitudnai sectional View of the lower portion of the core barrel.

Figur-e 3 is a fragmentary iongitudinal secticnai view of the upper portion of the core retaining tubes and the hold-down means.

Figure 4 is a side elevaton of the same. j Figure 5 is a fragmentary longitudinal sectional eff/ i w of the core retaining t e Figure 6 is a fragmentan side elevation of the lower end of one of the core ;etaining tubes.

i Figure 7 is a fragmentary' longitudinal sectional view of the core catcher and the lower end of the core retaining tubes.

Referring more particularly to the drawings, the numeral I indicates the outer barrl-which is attach'ed at its upper end to'the drill pipe, in

the usual and weil known manner, this construc- 50 tion being so usual that it is not shown. A core A. bit 2 screwsonto'the lower'end of the core barre] l 'for the purpose 01' cutting into the formation.

A protector barrel"3 screws into the core bit 2 and extends upwardh" 'from this'bit within the outer barrel I. p The protector barre1 3 is spaced from the inner surface of the outer barrel I so as to provide a circuiating passage 4. A pluraiity of circulation hoies 5 are provided in the bit 2 thru which the circuiating mud flows, for the usual purpose. A cup 6 screws onto the upper 5 end of the protector barrel 3 for-;the purpose of preventing any cirouiating fluid from entering the top of the protector barrel and disturbing or washing away the core, as will be further described.

e core catcher ring 'i fits within a seat 8 in the core bit 2. The core catcher ring is thus rotatably mounted in the core bit so that the core-receiving portion of the barrei can remain stationary while the outer barrei and the bit rotate and advance into the formation. A hold dbwn barri 9 screws onto the core catcher ring 'i and extends upwardiy therefrom'within the protector barre! 3. A head i@ screws onto the upper end oi' the hold down barrel 9, and suitable bearings H are mounted between the head and the protector barrei 3. for the purpose of suspending and rctatahly mounting the hold down barrei within the core barrei. The hold down barrei %E is spaoed from the protector barrel 3, thus providing a fluid relief passage E?. This I reiief passage extends the :full length of the hold down barre! and a plurality of relief ports 53 are provided in the bit 2, said ports i extending into the relief passage, thereby permitting the fluidwhich accumuiates in the-relief passageto flow out of the harrel. t

The circulation hcles 5 and the reiief ports 53 may he so arranged that there is a syphoning action of the circuiating mud passing thru the circulation hoies, thus tending to draw fluid out of the passage i2. I A plurality of relief ports Hi. are' provided at the upper end of the hold down barrel 9 and these ports extend 'into the passage !2, thus spermitting fluid to flow outwardly into the' pasthe 'core which is entering the hold down barrel,

as is common in core barrels heretofore in use.

A plurality of core retaining tubes |5 are' Y telescopically mounted withinthe hold down barrel 9; The tubes` IS rest on stepped seats IS in the core catcher ring I the purpose of this ks construction being to prevent circulatin'g mud within the tubes I is forced upwardly thru s a`nd thence out thru the ports u and the pas-" 'sage l2, as previousiy described.

i the next adJacent tube is engaged and is carv ried upwardl'y by the following arrangement-a plurality of springflngers Is are mounted on the outside of each of the tubes IS at the lower end thereof, These spring are counter-sunit into the tube so that when compressed, a smooth outer J surface is presented. g e

A shoulder 20"is provided on the inner surface v oi' 'each'oi the tubes adjacent the upper end. As

a tube, reaches the top of `its movement,`the spring s springsoutwardiy and 'e s ges the shoulder 20; ontinued upper movement of the innermost tube |5 will then drag -the next-'adjav As each s'uccessive tube I! moves upwardly,--``

cent outer tube along with it. Thus, each of the tubes, in succession is engaged and caused to move upwardly a`s the barrel fllls with the core.

To disengage the tubes I! each from the other, slots 2| are provided thru the shoulder 20 and the springs s can be rotated so as to align with the siots, thus permitting the inner tube to slip upwardly out of engage'me'nt' with the next edjscent tube.

A second safety shoulder 22 may be provided on the inside of each of the tubes i! above the shoulder 20. The second shoulder also has Slots '23 extendingtherethru tokper mit disassemblage of the tubes 5 i To insure that each of the tubes will rise in proper' order, i. e., that none of the outermost tubes15 will move upwardly with the inner tubes,

we provide a latch mechan'ism 24. This latch mechansm comprises a plurality of dogs 25 which are pivotall'y mounted in the hold down barrel S, and these dogs are urged inwardly by springs 26. Thebottom surface' of each of the dogs bears against the upper edges'of the tubes '85 when'the tubesare' in lowered position as shown in Fig's. 1 and-3. The hottom oi' each of the dogs !lis rounded so that as the innermost .tube rises, it will press the dog outwardly sufliciently to permit the tube to rise. Each successive tube will likewise *engage the dogs as said tube starts to rise, will press the dog outwardly and continue its movement upwardly. 'The remain: ing tubes which are 'notin position to move up.- wardly, are held down by the dogs until the tube is engaged inthe manner previously described.

-Ifdesired, the sleeve IT may be provided with an anmilar packing 21 which beats against the' inner wall of the hold down barrel 9, thus preventing any fluid {rom flowing downwardly around outside of the sleeve.

\ Having .desribed our invention, we claim:

L In a core drill 'tor well drilling operations, having a core bit-at the bottom end, an' outer within the outer barrel;

core advances into the drill, and antifrictiori means rotatably mounting the core retaining tube' within the outer barrel. A

- 2. In acore drill for well drilling Operations, having a core bit at the bottom end, an outer barrel secured to the core bit and rising thererrom. a core retain'ing tube made of telescoping sections mounted within the' outer barrel and I adapted to telescopioally extend when and as a core advances into the d-lll, and means releasably engaging the telescoping sections whereby said sections 'are permitted to extend upwardly one at a time'.

3. In a core drill for well drilling Operations, having acore bit at the bottom end, an outer' barrei secured to the core bit and rising there- ,A

from, a core retaining tubemadeot telescoping sections mounted within the outerbarrel and adapted to telescopicaily extend when and as a V core advances into the drill, anti-friction means rotatably mounting the core retain'ing tube with'- in the outer barrel, and means releasably engaging the; telescoping, sections whereby saidsections are permitted-to `e tend upwardly one at` a time. v

4. In a core drill for welLdrilling operations,

having a core bit at the bottom'end, an outer v barrel securedto the core bit and rising theref rom, a core retaining tube made of .telescoping sections mounted within the outer barrel and adapte'd to telescopically extend when and as core advances into the drill.. means releasably en'gaging the telescoping sections whereby said. sections are permitted to extend upwardly one at a time, and inten-engaging means 'between adjacent telescoping sections whereby each section is successively engaged and caused to move upwardly as the adjacent inner section reaches the top of its movement. V 75; In a core drill, an outer core bar-reli a teleseoping core tube extensibly mounted within the outer barrel and adaptdto-g uide and hold a core as it advances into the core drill. and anti-rriction means rotatably mounting 6. In na core' drill, an outer core barrel, a tele scoping core tube extensibly mounted within the outer'` burrel. and adapted to guide and hold a core ,as it advances into the core drill, anti-rriction means rotatably mountlng :the core tube within the outer barrel, and means releas engaging the telwcoping sections-whereby said.

the core tube n sections are permitted to extend upwardly one at a. time. v

"7. In a core drill for well drilling Operations. having a core bit at the bottom end, an outer barrel'secured to the core bit and rising there- `from, a core retaining tube madeof telescoping sections mounted within the outer barrel and' adapted to telescopically exte'nd when and as'a core advancesiito the drill, means'releasably engaging the telescoping sections whereby said sectionsare permitted to extend upwardly one at a time, inter-en'gaging means between adjacent telescoping sectionswhereby each sectionis successively engaged and caused to move upwardly as the adjacent inner section reaches the .tp of it's movement, and anti-friction means robarrel'securedto the coregbit and riing therefrom, a coreretainirgtube made oftel escoping sections mounted within the ;outer bar'el and adapted to teiescopically extend when and as a tatably mounting the core tube within the outer barrel. v 8. In a cbredrill, a holiow outer' core barrl,

telscopicaly mounted core tubes normally disposed in the lower end of the outer core barre] and adapted to telescopically follow any material xnte-ing thecore drilLwith the innermost of said &osmane means reieasably engaging said core retaining core tubes coming into contact with the entering core first, and succeeding sections following in the arranged order, and yieldable inter-connecting means between adjacent core tubes whereby the tubes are caused to move upwardly in order.

i).` In a core drill, a houow outer core barrel, teleecopically mounted core tubes normally disposed in the lower end of the outer core barre! and adapted to telescopically follow any material entering the core drill, with the innermost or said core tubes coming into contact with the entering core flrst, and succeeding sections following in the arranged order, inter-connecting means between adjacent core tubes whereby the tubes are caused to move upwardly in order, and releasable means engaging the core tubes adapted and ar'- ranged to release said tubes one at a time.

10. A core drill comprising an outer barrel, a core bit attached to the lower end oi said barrel, a protector barrel attached to the core bit and rising within the outer barrel, a cap on the upper end of the protector barrel, a core catcher ring seated in the core bit, a hold down barrel attached to the core ring catcher and rising within the protector barrel, said hold down barrel and protector ban-el being spacedapart to provide a fluid passage, said protector barrel having outlet openings in the top thereof, and said core bit having fluid relief holes extending into said passage and telescoping core tubes extensibly mounted within the hold down barrel.

11. A core drill comprising an outer barrel, a core bit attached to the lower end of said barrel, a protector barrel attached to the core bit and rising within the outer barrel, a cap on the upper and centered within the protector barrel.

12. A core drill comprising an outer barrel, a core bit attached to the lower end of said barrel, a protector barrel attached to thecore bit and rising within the outerbarrel. a cap on the upper end ot the protector barrel, a core catcher ring seated in the core bit, a hold down barrel attached to the core ring catcher and rising within the protector barrel, a plurality of extensible core retaining tubes within the hold down barrel, a nd means releasably engaging said core rev the protector barrel, a plurality oi'v extensible core retaining tubes within the hold down barrel,

tubes whereby they are released one at a time. and inter-engaging means between adjacent core retaining tubes wherebysaid tubes are successively engaged and moved upwardly as'the core enters the drill.

14. A core-drill comprising an outer barrel, a core bit attached to the lower end of said barrel, a protector barrelattached to the core bit, and rising within the outer barrel, a cap on the upper end of the protector barrel, a core catcher ring seated in the core bit. a hold down barrel attached to the core ring catcher and rising within the protector barrel, a plurality of extensible core retaining tubes within the hold down barrel, a plurality of dogs pivotally mounted in the hold down barrel, spring means engaging each of the dogs whereby they are urged inwardly. said dogs hearing against the upper edges oi' the tubes and being adapted to be pushed outwardly as each successive tube starts to move upwardly.

15. In a. core drill comprising an outer barrel, a core bit attached to the lower end of the' outer barrel, a protector barre] attached to the core bit and extending upwardly within the outer barrel,

a core catcher ring seated in the core bit, a hold down barre] attached to the core catcher ring and rising within the hold down barrel, a plurality ot telescopically mounted core tubes within the hold down barrel, and stepped seats on the core catcher ring upon which the core retaining tubes are adapted to rest when in lowered position.

16. In a core drill comprising an outer barrel, a core bit attached to the lower end of ,the outer barrel, a protector barrel attached to the core bit and extending upwardly within the outer barrel, a core catcher ring seated in the core bit, a hold down barrel attached to the core catcher ring and rising within the hold down barrel,

'a hearing between the hold down barrel and the innermost o! said core tubes.

17. In a core drill comprising an outerbarrel, a core bitattached to the lower end of the outer barrel, a protectorbarrel attached to the core. bit and extending upwardly within the outer ban-el; a core catcher ring seated in the core bit. a'hold down bari-el attached to the core catcher ring and rising within the hold down barrel, a hearing between the hold down barrel and the protector barre] whereby the hold down barrel is centered and rotatably mounted within the protector barrel, a plurality oi' telescopically mounted core tubes within the protector barrel, a. sleeve attached to the upper end oi' the innermost of said core tubes, said protector barrel and hold down barrel being spaced apart to provide a fluid passage, said hold down barrel having ports adjacent the upper end thereof' and extending into said fluid passage, said core bit having fluid reliei holes extending into said fluid passage.

ARTHUR sou.. LEWIS A. meson. 

